rosentreter



(No Model.) 2 Sheets-Sheet 1.

W. E. LAPE 8v A. J. ROSENTRETER. PNBUMATIC DOOR CHECK.

WITNESSES: INVENTORS Tn: Nonms Parini co, Pnoaurumwmucwn. u. cv

2Sheets-Sheet, 2. W. E. LAPE 8v A. J; ROSENTRETBR.

(No Model.)

.PNEUMATIG Doon CHECK.

Patented May l1, 1897.

INVETEUZ M TORNEY wl'mrissls:

4f' Y( O ZLAT co., bMoToAumo wAs UNITED STATES PATENT OFFICE.

VILLARD E. LAPE AND ALBERT J. ROSENTRETER, OF SYRAOUSE, NEW YORK,ASSIGNORS, BY MESNE ASSIGNMENTS, TO EDWTIN L. LOOMIS,

OF SAME PLACE.

PN EU MATlC DOOR-CHECK.

SPECIFICATION forming part 0f Letters Patent No. 582,392, dated May 1 1,1897. Application iiled November 8, 1895. Renewed March 9, 1897. SerialNo. 626,694. (No model.)

To @ZZ whom t mag/ comerm- Beit known that we, WILLARD E. LAPE andALBERT J. ROSENTRETER, of Syracuse, in the county of Onondaga, in theState of New York, have invented new and useful Improvements inPneumatic Door-Checks, of which the following, taken in connection withthe accompanying drawings, is a full, clear, and exact description.

This invention relates to the class of combined door springs and checkin which a spring forces the door to its closed position and anair-cylinder has its piston actuated by the movement of the door, so asto charge said cylinder with air automatically by the swinging of thedoor to its open position and form an vair-cushion which checks themovement of the door to its closed position; and the invention consistsof an improved construction and combination of its component parts, ashereinafter described, and set forth in the claim.

In the annexed drawings, Figure lis a face view of a portion of a doorequipped with a combined door spring and check embodying our invention.A portion of the air-cylinder is broken away to show the piston. Fig. 2is a transverse section on line X X in Fig. l and presenting a plan Viewof our invention in its normal position. Fig. 3 is a similar viewshowing the combined door spring and check in two of its operativepositions when the door is opened. Fig. 4 is a transverse section of thespring-actuated spool; and Fig. 5 is an end view of the door, showingthe connections of the air-cylinder to the door and to thespring-actuated band which draws the door to its closed position.

Similar letters of reference indicate corresponding parts.

D represents the door, which is hinged at one of its vertical edges inthe usual manner.

a denotes the air-cylinder, which is hinged or pivotally connected atits closed end, preferably to a suitable bracket l), secured to the faceof the door a suitable distance from the door-casing O. The outer end ofthe pistonrod c is provided or formed with a laterallybifurcated headc', by which said rod is normally connected to a lug or spur d,projecting from a plate P, which is rigidly secured to the door-casingO.

In the approachvof the door toward its extreme open position the side ofthe pistonrod com es in contact with the face of the door and is therebycrowded laterally and caused to throw its bifurcated head out ofengagement with the lug d, as illustrated by dotted lines in Fig. 3 ofthe drawings. The object of said detachable connection of the pistonrodis to dispense with the use of the togglearms and other protruding armsand levers employed in priorconstructions, whereby our improveddoor-check can be used between two doors arranged o ne in front of theother and in proximity thereto, as in the arrangement of a screen-doorwith the door proper.

To the plate P is pivoted a spool e, which is actuated by a coiledspring j', attached at one end to said spool and at the opposite end tothe pin which is fastened to the plate P, and has the spool pivoted toit. Upon this spool is wound a band or chain g, which is fastened at oneend to the spool and at the opposite end to the end of the cylinder a.,adjacent to the bracket l). This latter attachment of the band or chainis made at a point 1T, which is eccentric to the axis of the cylinderand farther from the door than the attachment of the cylinder, asclearly shown in Figs. 2 and 5 of the drawings. The purpose of theattachment of the band g to the cylinder a at the point t' is to causethe spring-restrained band g to exert a strain on the cylinder a, so asto hold the bifurcated head c of the piston-rod normally engaged withthe lug d.

The operation of our described pneumatic door-check is as follows: Inswinging the door to its open position the attachment of the piston-rodo to the lug CZ causes the piston of the cylinder a to be drawn outward,as shown in Fig. 8 of the drawings. The cylinder is provided with asuitable valve in its closed end similar to other cylinders of thisclass, and in the aforesaid movement of the piston the cylinder ischarged with air through the said valve. At the same time a draft isexerted on the band or chain g, which turns the spool c and therebywinds up the spring f. As soon IOO as thedoor is released from pressuretoward its open position the resilience of the spring causes the spool et0 draw, by means of the band or chain g, the door to its closedposition and at the same time exert a lateral strain on the cylinder a,so as to insure the engagement of the bifurcated piston-head c with thelug d, which latter is concentric to the axis of the spool e. In thislatter movement of the door the attachment of the piston-rod to the lugCZ causes the piston-rod to be pushed toward the closed end of thecylinder @,whereby its movement is resisted by the air contained in thecylinder, and thus the movement of the door is checked and then allowedto gradually move to its closed position by the gradual escape of theair from the cylinder.

What We claim as our invention is The combination with the door-casingand door, of a bracket secured on the casing, a spring-actuated spoolpivoted to said bracket,

the air-cylinder hinged to the door, a pistonrod detachably connected tothe aforesaid bracket, a band or chain Wound upon the spool andconnected to the hinged end of the cylinder to hold said rod normally inits engagement with the aforesaid bracket, said rod being thrown out ofengagement by contact with the face of the door in the approach of thedoor toward its extreme open position, and said band or chain drawingthe door to its closed position and the rod to its connection with thebracket to operate the rod in the cylinder to check the door in itslatter movement as set forth.

In testimony whereof we have hereunto signed our names this 2d day ofNovember,

WILLARD E LATE. V[L: s] ALBERT J. ROS'ENTREIER. [n s] iVitnesses:

J- PT- M A. LEYDEN.

